It happened shortly before 8:30 a.m. Friday at a track interlocking between Kerlin Street and Concord Road in Chester, Pennsylvania.

One CSX freight train was traveling from Richmond, Virginia to Pavonia, New Jersey with three locomotives and 64 empty freight cars, when it collided with another CSX train traveling from Quebec, Canada to Atlanta, Georgia, with one locomotive and eight intermodal cars carrying consumer goods and food products.